Rings Plus Pi Bonds Formulation
For molecules containing only carbon, hydrogen, monovalent halogens, nitrogen, and oxygen, the formula
where C = number of carbons, H = number of hydrogens, X= number of halogens and N = number of nitrogens, gives an equivalent result. Oxygen and other divalent atoms do not contribute to the degree of unsaturation, as (2-2) = 0.
The degree of unsaturation is used to calculate the number of rings and pi bonds, where
- Rings count as one degree of unsaturation
- Double bonds count as one degree of unsaturation
- Triple bonds count as two degrees of unsaturation
Read more about this topic: Degree Of Unsaturation
Famous quotes containing the words rings, bonds and/or formulation:
“‘She has got rings on every finger,
Round one of them she have got three.
She have gold enough around her middle
To buy Northumberland that belongs to thee.”
—Unknown. Young Beichan (l. 61–64)
“Oh! I have slipped the surly bonds of earth,
And danced the skies on laughter-silvered wings ...
And while with silent lifting mind I’ve trod
The high, untrespassed sanctity of space,
Put out my hand and touched the face of God.”
—John Gillespie Magee (c. 1922–1941)
“In necessary things, unity; in disputed things, liberty; in all things, charity.”
—Variously Ascribed.
The formulation was used as a motto by the English Nonconformist clergyman Richard Baxter (1615-1691)